Catch can drain back to oil pan Do or Don't??
 

Is there any reason I shouldn't run a drain back into my oil pan from the catch can. LSx 427 / Large frame T-6 turbo. First hand answers please, Thanks! [IMG]http://i1216.photobucket.com/albums/...ps50c48742.jpg[/IMG]

No you will get condensation that forms in the can. You def dont want to contaminate the oil and then run it right back through your motor.

:judge: hail naw

Bad idea

What about in the event of a sealed catch-can setup? Still a bad idea? Where does the condensation come from?

The whole idea of a catch can or crankcase evac system is to pull/collect vapors from your engine, vapors include condensation thats accumulates just like the morning dew accumulates on your window. So draining it back into the pan would undo what you wanted it to do to begin with. When my car runs E85 I can dump out almost a quart of water in a month.

As stated it's a bad idea.

Ding ding ding. Words of wise right there.

Its would be easier for you to run no catch can then. You are defeating the purpose. On a side note, how necessary are catch cans? On my turbo car im sure oil temps are over 212. So wouldn't the water boil away? I have never run one,boosted for 4 years now and no issues. I just run open breathers

The purpose of a catch can is to get rid of the mess of having breathers sweating onto things which become a fire hazard. Catch cans are just a more accurate way to collect the junk and prevent it from entering back into the engine.

This is what a typical catch can will capture. About 80% water (on the bottom), 20% oil. Depends on how much oil gets blown out of the line, but for the most part, the catch can is condensing the steam and combustion blow-by that gets past the rings and could contaminate the oil. Imagine pouring this back into your motor oil (i.e. drainback).
Not healthy for the motor oil/engine.
http://redlinemotorworks.files.wordp...oil-closer.jpg

that's disgusting lol. i guess i should get one too

Whenever I drain my catch can it's mostly clear, smells a little bit of alcohol or something. Could be e85. But yeah, definitely don't want that back in your oil pan ;)

Been running mine like that for a few years with no issues.

The can itself does gather a lot of mayo, but it's certainly never caused any problems and is more down to the can being remotely mounted and being cooler than the engine itself actually causes the condensation to form.

I dont do it, JMO.

do any of you run 2 breathers on both valvecovers then run lines from both covers to a catch can?

The benefit of crankcase ventilation is to prevent the inside of an engine from becoming the pressurized and propagating leaks.

Positive crankcase ventilation induces a controlled flow pattern of: in through the breather and out into the intake tract. The benefits of this are preventing oil mess at the breather and to prevent emissions into the atmosphere.

The benefit of the catch can is to stop engine oil picked up in the positive crankcase ventilation from entering the intake tract. Engine oil in the intake tract leads to: fuel mixture contamination as well as valve and combustion chamber deposits that can cause reduced flow, and pre-ignition.